docs: fix changelog

Author: numb86

CHANGELOG.md

@@ -11,7 +11,7 @@ All notable changes to this project will be documented in this file. See [standa
 
 
 
-## [3.7.0](https://github.com/webpack/webpack-dev-server/compare/v3.5.1...v3.7.0) (2019-06-06)
+## [3.7.0](https://github.com/webpack/webpack-dev-server/compare/v3.6.0...v3.7.0) (2019-06-06)
 
 
 ### Bug Fixes
@@ -20,11 +20,6 @@ All notable changes to this project will be documented in this file. See [standa
 * es6 syntax in client ([#1982](https://github.com/webpack/webpack-dev-server/issues/1982)) ([802aa30](https://github.com/webpack/webpack-dev-server/commit/802aa30))
 
 
-### Features
-
-* **server:** add serverMode option ([#1937](https://github.com/webpack/webpack-dev-server/issues/1937)) ([44a8cde](https://github.com/webpack/webpack-dev-server/commit/44a8cde))
-
-
 
 ## [3.6.0](https://github.com/webpack/webpack-dev-server/compare/v3.5.1...v3.6.0) (2019-06-05)